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There is <?php echo CRoute::getURI(); ?> inside <?php ... ?>!
On demo site there are no icons bellow image for each gallery for number of photos, views, comments and likes. That is the part of code that generates 403 error.

Licenses:

JomSocial Active

This error cannot be seen with (Web)Inspect but should be looked in page source:
demo.jomsocial.com/906-customer/photos
look at page source line 1002 or search for "<?php echo CRoute::getURI(); ?>" in page source